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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N57 / M57 Turbo Diesel Discussions - 335d > any gearbox specialists out there ?



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      07-02-2015, 08:31 AM   #1
Si-335d
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any gearbox specialists out there ?

I've notice my gear changes are shifting earlier than they used to

In "Drive" it's around 4200 and in "Sport" around 4600.

This is under full load acceleration. any ideas ?
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      07-02-2015, 10:01 PM   #2
dr_dirtg
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Might be your boost presure valves or vacuum leak starting to show up.
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      07-03-2015, 12:39 AM   #3
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Quote:
Originally Posted by dr_dirtg
Might be your boost presure valves or vacuum leak starting to show up.
Really? how would this cause the issues I'm having in the way the gearbox behaves ?

What can I say to the technician to help him look into this ? as currently he said they will check the oil level and look for error codes. I have not had any error lights show up, so not convinced they will find any codes.
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335d MSport Coupe LCI:- 19" Apex EC-7's (8.5j ET35/9.5j ET33) Factory fitted Sunroof, BMW Perf Carbon Fibre:- Boot Spoiler, Mirrors & Front Lip Splitter, SSDD Carbon Fibre Rear Diffuser, Roof Spoiler, Black Kidney Grills, Red Calpiers, CKS Custom Exhaust, Wagner FMIC, ITG Air Filter, Sprint Booster, DMS 380+BHP / 600+Ft lbs Remap, Quaife LSD, Weicher front & rear strut brace, Forge charge pipe, JFA Gearbox TCU Remap

Last edited by Si-335d; 07-03-2015 at 02:27 AM.
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      07-03-2015, 04:57 AM   #4
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when i had boost leak, changes were actually later and there was a slippage, because the boost was unable hold the power, so the car revved higher.

but your question is not clear. did you lose power or anything!? gearbox changes are adapting to driving style and other characteristics such as engine boost, pdf backpressure when regeneration going on, and other things, so it changes, or even your wife could be driving and car adapted, so be more specific what u r asking. are your changes hard, rev gauge is shaking? car lost power? if nothing, i would not worry....worry about other things, as this quesiton is really vague
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      07-03-2015, 06:59 AM   #5
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Quote:
Originally Posted by Martin80k
when i had boost leak, changes were actually later and there was a slippage, because the boost was unable hold the power, so the car revved higher.

but your question is not clear. did you lose power or anything!? gearbox changes are adapting to driving style and other characteristics such as engine boost, pdf backpressure when regeneration going on, and other things, so it changes, or even your wife could be driving and car adapted, so be more specific what u r asking. are your changes hard, rev gauge is shaking? car lost power? if nothing, i would not worry....worry about other things, as this quesiton is really vague
2nd to 3rd gear Change under hard acceleration seems a bit more clunky too but the revs used to go to 5000 and change gear without using the pedal shift, now it changes far earlier on its own
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      07-04-2015, 09:02 AM   #6
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Have you tried clearing the adaptions?
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      07-04-2015, 10:22 AM   #7
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Quote:
Originally Posted by Mik325tds
Have you tried clearing the adaptions?
Now sure how
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      07-04-2015, 11:49 AM   #8
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Quote:
Originally Posted by Si-335d View Post
2nd to 3rd gear Change under hard acceleration seems a bit more clunky too but the revs used to go to 5000 and change gear without using the pedal shift, now it changes far earlier on its own
So, going to 5,000 is an error. Shifting at 4,600 is normal.
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      07-04-2015, 01:16 PM   #9
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Quote:
Originally Posted by DWR
Quote:
Originally Posted by Si-335d View Post
2nd to 3rd gear Change under hard acceleration seems a bit more clunky too but the revs used to go to 5000 and change gear without using the pedal shift, now it changes far earlier on its own
So, going to 5,000 is an error. Shifting at 4,600 is normal.
Yeah I get that but it used to shift up at 5000 if I didn't shift earlier but shifts at anything from 3800 to 4600 under full throttle without me doing anything
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      07-04-2015, 04:25 PM   #10
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Quote:
Originally Posted by Si-335d View Post
Yeah I get that but it used to shift up at 5000 if I didn't shift earlier but shifts at anything from 3800 to 4600 under full throttle without me doing anything
Sorry, I didn't get that you knew it had a problem all along, from your description.
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